Fishing grapnel sinkers are specifically designed for surf fishing, featuring prongs that wedge into the sand to prevent the sinker from shifting with strong currents or waves. These prongs provide stability, anchoring the sinker in place, ensuring your bait stays where you want it. However, when you need to retrieve your line, the prongs detach from the sinker upon being yanked or pulled, allowing for easy release without damaging your setup. This unique design makes grapnel sinkers highly effective for surf fishing, where controlling your bait's position is essential for attracting fish.